Ejector-extractor mechanism for repeating auxiliary firearm of pump action type



Feb. 22, 1966 R. F. MAGARDO EJECTOR-EXTRACTOR MECHANISM FOR REPEATING AUXILIARY FIREARM 0F PUMP ACTION TYPE Filed March 15, 1965 5 Sheets-Sheet 1 Jumwwh lNVENTOR m u M w u m R BY ZZZ 15W ATTORNEYS Feb. 22, 1966 R. F. MAG/moo 3,235,993

EJECTOR-EXTRACTOR MECHANISM FOR REPEATING AUXILIARY FIREARM OF PUMP ACTION TYPE Filed March 15, 1965 3 Sheets-Sheet 2 mum , as 87 9a 3 86\ 82 42 a0 34 IN VENTOR 54 92 9e 94 96 72 76 RnlnerlEMnguinflu AW; M, W

ATTORN EYS 1955 R. F. MAGARDO 3, 35, 93

EJECTOR-EXI'RACTOR MECHANISM FOR REPEA'IING AUXILIARY FIREARM OF PUMP ACTION TYPE Filed March 15, 1965 3 Sheets-Sheet 5 7 90 a4 86 7 63 so \e 32 72 I log w INVENTOR Roller if: Mgg u'rflu mi frm'i ATTORNEYS United States Patent 3,235,993 EJECTOR-EXTRACTOR MECHANISM FOR RE- PEATING AUXILIARY FIREARM 0F PUMP ACTION TYPE Robert F. Magardo, Springfield, Mass., assignor to the United States of America as represented by the Secretary of the Army Filed Mar. 15, 1965, Ser. No. 440,040 8 Claims. (CI. 42-25) (Granted under Title 35, US. Code (1952), see. 266) The invention described herein may be manufactured and used by or for the Government for Government-a1 purposes without the payment to me of any royalty thereon.

This invention relates to auxiliary type firearms which are attached to the barrels of shoulder type weapons and pertains more particularly to the ejector mechanisms for such auxiliary firearms.

Modern type firearms are being designed with increased fire power achieved by mounting an auxiliary firearm of a diiferent capability to a conventional shoulder arm. It is obvious that such auxiliary firearms must be as light and as compact as possible. It is, therefore, the object of. this invention to provide a repeating auxiliary firearm which is light in weight and compact in construction.

It is a further object of this invention to provide for such an auxiliary firearm a multiple purpose ejector mechanism which serves as an ejector, an extractor and a cartridge retainer and which utilizes a coil torque spring for compact structure.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in which:

' FIG. 1 is an elevational view of an auxiliary type firearm with the slidable barrel shown in battery position;

FIG. 2 is a view taken along line 22 of FIG. 1;

FIG. 3 is a view similar to FIG. 2 but shows the barrel moved forwardly to where the ejector is actuated thereby to eject the fired cartridge case;

FIG. 4 is a fragmentary view similar to FIG. 3 but shows the latch cam actuated to release the ejector from the actuator bar;

FIG. 5 is a view similar to FIG. 4 but shows the ejector returned to its rearward position and the actuator bar located in its forward position;

FIG. 6 is a view taken along line 66 of FIG. 3;

FIG. 7 is a view taken along line 7-7 of FIG. 6; and

FIG. 8 is an exploded, perspective view of the ejector and actuator bar.

Shown in the figures is an auxiliary, pump actiontype firearm 12 including a receiver 14 with a breechblock 16 fixed thereto, a barrel 18 slidingly supported in the receiver for manual displacement between a forward loading position and a rearward firing position, and a folding rack 20 for holding a supply of cartridges 22. Barrel 18 is formed with an integral handgrip 23 to provide for manual, pump action thereof. Rack 20 includes a slideway formed by a pair of rails 24 which are received by extractor grooves 26 of cartridges 22 on opposite sides thereof for mounting a plurality of the cartridges so as to be slidingly displaceable to a battery position in receiver 14 when barrel 18 is in the loading position. When one of the cartridges 22 is in battery position, base 28 thereof is held in contact with the front face of breechblock 16,

3,235,993 Patented Feb. 22, 1966 as hereinafter described, so that firing pin 30 may strike the primer of the cartridge for discharge thereof. Cartridges 22 are biased upwardly in rack 20 to the battery position by a spring device (not shown).

When a cartridge 22 is in battery position, it is out of guiding contact with rails 24 and is held instead between a track 32 on one side of breechblock 16 and an ejector 34 mounted on the opposite side thereof as hereinafter described. Ejector 34 is a component of ejector mechanism 36 which also includes an actuator bar 38, a latch 42 and a coiled torsion spring 44.

Actuator bar 38 is slidingly carried by barrel 18 by means of a longitudinal dove-tail slot 46 therein so as to be slidingly displaceable between a forward and a rearward position relative to the barrel. The longitudinal displacement of actuator bar 38 is limited through the cooperation of a longitudinal slot 48 in the actuator bar with a stop 50 which is fixedly mounted in bar-rel 18 so as to extend outwardly therefrom into the slot. When stop 50 is contacted by front end 52 of slot 48 during forward displacement of barrel 18, the continued forward displacement thereof is transferred to actuator bar 38 and, when the stop is contacted by rear end 54 of the slot during rearward displacement of the barrel, the continued rearward displacement thereof is transferred to the actuator bar. The forward displacement of actuator bar 38 relative to receiver 14 is limited by the contact of a tang 56 on the rear end of the actuator bar with a ledge 58 on the receiver. Contact of ledge 58 by tang 56 and of front end 52 by stop 50 limits the forward displacement of barrel 18 which is stopped thereby in the loading position.

Ejector 34 is slidingly mounted in the side of breechblock 16 for longitudinal displacement relative thereto by a T-slot 62 in the breechblock. A clearance 63 provides an opening into T-slot 62 from the side of breechblock 16 and such clearance slidingly receives the rear end of actuator bar 38 which is thereby slidable over the outside of ejector 34. Actuator bar 38 is connectable to ejector 34 through the cooperation of a longitudinal slot 64- in the actuator bar with a pin 66 which projects from the ejector through the slot. Slot 64 is provided with a rear end 70 which, when in contact with pin 66, limits rearward displacement of ejector 34 respective to actuator bar 38. Actuator bar 38 is releasably engageable with ejector 34 by means of latch 42 as hereinafter explained.

Latch 42 is of T-configuration and includes a bar 72 having approximately the same length as the width of clearance 63 and a shaft 74 extending from the bar. Shaft 74 is received by a mating laterally disposed bore 76 in ejector 39 and such bore is counterbored at 78 to a shoulder 80 to receive a compressible spring 82 coiled. around shaft 74 and a button 84 formed at the free end of the shaft. The action of spring 82 against button 84 and shoulder 80 biases latch 42 inwardly to where bar 72 resiliently contacts the adjacent surface of ejector 34. When bar 72 is in contact with the adjacent surface of ejector 34, button 84 extends from the inner side of ejector 34 so as to be slidingly contactable by a cam slide 86 in breechblock 16. Cam slide 86 is gene-rated so that, as ejector 34 is displaced forwardly, latch 42 is pressed outwardly from a latching to an unlatched position, reaching the unlatched position when theejector is in its forward position.

A lip 87 extends forwardly from ejector 34 for engagement with extractor groove 26 of cartridge 22 when displaced to battery position and so that forward displacement of the ejector is transferred to the engaged side of cartridge 22. A land 88 extends longitudinally along the outside of ejector 34 within clearance 63 and such land is narrower than the clearance so that a pair of channels 90 are provided between the opposite sides of the land and the respective sides of the clearance. Provided on the inside of actuator bar 38 at the rear end thereof is a pair of flanges 92 which are slidingly received by channels 90 and. such flanges extend rearwardly of tang 56 to form a pair of hooks 94. Hooks 94 are respectively provided with a ramp 96 which inclines outwardly and forwardly so that, when actuated rearwardly over the extending arms of bar 72, latch 42 is cammed outwardly to the unlatched position. Provided forwardly of each of the ramps 96 is a recess 98 which receives the extending arms of bar 72 when in registry therewith for releasably connecting actuator bar 38 to ejector 34.

Ejector 34 is biased rearwardly by a spring device 100 which includes torsion spring 44 and an arm 102 which is fixedly mounted at one end to a vertical rod 104 journaled for rotation in breechblock 16 adjacent the side opposite that in which ejector 34 is mounted. The free end of arm 102 is contactable with a forwardly facing ledge 106 formed in the inner side of ejector 34 so that rotation of the arm is convertible to rearward. displacement thereof. Arm 102 is resiliently pressed against ledge 106 by torsion spring 44 which is coiled around rod 104 and is engaged at opposite ends to receiver 14 and such arm.

Operation Firearm 12 is ready to be fired when barrel 18 is in the closed firing position and a cartridge 22 is inclosed therein in battery position. The battery position cartridge 22 is held. against the face of breechblock 16 so as to be contactable by firing pin 30 through the cooperation of track 32 and lip 87 of ejector 34.

After the chambered cartridge 22 is discharged, spent case 110 thereof is ejected and a fresh cartridge located in battery position by moving barrel 18 to the forward loading position which is accomplished by grasping handgrip 23 and pushing forwardly thereagainst. During initial forward movement of barrel 18, fired case 110 is held back to be extracted from barrel 18 by ejector 34 and track 32. As barrel 18 is further displaced, stop 50 contacts front end 52 so that the continued forward movement of the barrel is transferred to actuator bar 38. With the continued forward movement of barrel 18 and actuator bar 38 together, ejector 34 is forwardly displaced therewith through the engagement of latch 42 with recesses 98 in hooks 94. The forward movement of ejector 34 causes the fired case 118 to be thrown sideways out of receiver 14 around the point of engagement of extractor groove 26 of the case With track 32 by the thrust given the opposite side of the case by lip 87.

When the rear end of barrel 18 is clear of the nose of the leading one of the cartridges 22 in rack 20, latch 42 is cammed to the unlatched position by contact of button 84 with cam slide 86 whereby ejector 34 is released from actuator bar 38. Ejector 34, when released, is immediately returned to its rearwardv position through the infiuence of spring device 180 in time for lip 87 to be received by extractor groove 26 of the leading cartridge 22 in rack as such cartridge is pressed to the battery position by the spring means (not shown). When the lea-ding cartridge 22 is in battery position, it is held therein by the engagement of lip 87 and track 32 with extractor groove 26 and by the bias of spring device 100 so as to be inclosed by barrel 18 when pulled rearwardly to the firing position. The forward movement of barrel 18 is stopped in the loading position by contact of tang 56 with ledge 58.

When barrel 18 is pulled rearwardly from its loading position, stop 50 moves along slot 48 until it contacts rear end 54 as the barrel nears its firing position. With stop 50 and rear end 54 in contact, the rearward movement of barrel 18 is transferred to actuator bar 38, whereby ramps 86 on hooks 94 cammingly engage the underside of bar 72. Latch 42 is consequently actuated outwardly to its unlatched position until recesses 98 are in registry with bar 72 whereupon the bar snaps into the recesses through the bias of spring 82, re-engaging actuator bar 38 to ejector 34 and making firearm 12 ready for firing the inclosed cartridge 22.

Although a particular embodiment of the invention has been described in detail herein, it is evident that many variations may be devised within the spirit and scope thereof and the following claims are intended to include such variations.

I claim:

1. A firearm for firing a cartridge having a case with a base and an extractor groove, said firearm including a receiver, a breechblock integral with said receiver, a rack adapted for holding a plurality of cartridges and for successively delivering the cartridges into said receiver at a battery position wherein the base of the cartridge is in contact with a front face of said breechblock, a track formed on one side of said breechblock for engagement with the extractor groove of one of the cartridges when at the battery position, a barrel mounted on said receiver for sliding displacement between a forward. loading position and a rearward firing position, an ejector mechanism arranged in cooperation with said track for retaining the base of the cartridge at the battery position in contact with the front face of said breechblock and for extracting the case of the cartridge from said barrel when actuated from the firing position, and means in said ejector mechanism arranged in cooperation with said. barrel and said track for ejecting the case sideways from said receiver when said barrel is actuate-d to the leading position.

2. The firearm as defined in claim 1 wherein said ejector mechanism includes an ejector, and an actuator bar and a latch disposed. in cooperation with said barrel for actuating said ejector to eject the case from said receiver when said barrel is clear of the case during actuation of said barrel to the loading position.

3. The firearm as defined in claim 1 wherein said ejector mechanism includes an actuator bar mounted in said barrel for sliding longitudinal displacement respective thereto between a forward and a rearward position, an ejector mounted on said breechblock opposite to said track for sliding longitudinal displacement relative thereto between a forward and rearward position, a lip formed on said ejector for engagement with the extractor groove in the case of the cartridge at the battery position, a latch arranged for releasably connecting said ejector to said actuator bar for forward displacement thereby, and cooperating means in said actuator bar and on said barrel for transferring forward displacement thereof to said actuator bar when clear of the case in said receiver.

4. The firearm as defined in claim 3 and including means for mounting said latch in said ejector, a spring for biasing said latch from an unlatched to a latching position, a cam slide formed in said breech for cooperation with said latch for actuating said latch to the unlatched position to release said ejector when said barrel is clear of the case in said receiver during forward displacement of said barrel.

5. The firearm as defined in claim 4 and including a spring device engaging said ejector for returning said ejector to its rearward position after being released from said actuator bar by said latch, and for biasing said ejector to its rearward position to resiliently hold the base of the next one of the cartridges against the front face of said breechblock when at the battery position.

6. The firearm as defined in claim 5 wherein said spring device includes a coiled torsion spring.

7. The firearm as defined in claim 5 wherein said spring device includes a rod, an arm mounted at one end to said rod, means for rotatingly mounting said rod in said breechblock so that an opposite end of said arm contacts a forwardly facing ledge in said ejector, and a torsion spring coiled around said rod and operationally dis posed between said breechblock and said arm for pressing said arm against said ledge to bias said ejector to its rearward position.

8. The firearm as defined in claim 5 and including means for re-engaging said latch to said actuator bar when said actuator bar is actuated to its rearward position,

and cooperating means in said actuator bar and on said barrel for transferring rearward displacement of said barrel to the firing position to rearward displacement of said actuator bar to its rearward position for re-engaging said latch to said actuator bar.

No references cited.

BENJAMIN A. BORCHELT, Primary Examiner. 

1. A FIREARM FOR FIRING A CARTRIDGE HAVING A CASE WITH A BASE AND AN EXTERIOR GROOVE, SAID FIREARM INCLUDING A RECEIVER, A BREECHBLOCK INTEGRAL WITH SAID RECEIVER, A RACK ADAPTED FOR HOLDING A PLURALITY OF CARTRIDGES AND FOR SUCCESSIVELY DELIVERING THE CARTRIDGES INTO SAID RECEIVER AT A BATTERY POSITION WHEREIN THE BASE OF THE CARTRIDGE IS IN CONTACT WITH A FRONT FACE OF SAID BREECHBLOCK, A TRACK FORMED ON ONE SIDE OF SAID BREECHBLOCK FOR ENGAGEMENT WITH THE EXTRACTOR GROOVE OF ONE OF THE CARTRIDGES WHEN AT THE BATTERY POSITION, A BARREL MOUNTED ON SAID RECEIVER FOR SLIDING DISPLACEMENT BETWEEN A FORWARD LOADING POSITION AND A REARWARD FIRING POSITION, AN EJECTOR MECHANISM ARRANGED IN COOPERATION WITH SAID TRACK FOR RETAINING THE BASE OF THE CARTRIDGE AT THE BATTERY POSITION IN CONTACT WITH THE FRONT FACE OF SAID BREECHBLOCK AND FOR EXTRACTING THE CASE OF THE CARTRIDGE FROM SAID BARREL WHEN ACTUATED FROM THE FIRING POSITION, AND MEANS IN SAID EJECTOR MECHANISM ARRANGED IN COOPERATION WITH SAID BARREL AND SAID TRACK FOR EJECTING THE CASE SIDEWAYS FROM SAID RECEIVER WHEN SAID BARREL IS ACTUATED TO THE LOADING POSITION. 